Cm400t rejet help

[ThePriest]

Hey guys, new here. I recently bought a cm400t for very cheap, and I'm doing a cafe racer build. Changing seat, handlebars, exhaust and weight here and there, pegs etc.

So my question: I removed my big ugly black air box and plan on putting cones/pods on. I see that many people have done this but all say you must rejet, but no one seems to have a solid answer as to what the measurements should be, so does anyone know what jets I would have to buy to run the stock carbs and just throw to cone filters on. I'm trying to go pretty cheap, so I'm hoping just a rejet and cones will be all I'll need. Has anyone done this and know the best size for the jets? Or is there a certain pair of cones that are sold that would restrict the airflow to the point where wouldn't have to rejet. Any help is appreciated!

 

[butzer489]

Wait for it...

 

[fresh_c]

Great first post! Start the motor and let me know if the bike revs above 6k wihtout the air box? If you can live with that go up a couple sizes on the jets and you are done! If you want it to run like factory, put the air box back on or get new carbs. There are a handful that know how to change the carbs internals by they tend to keep their mouths zipped on the subject.

 

[ThePriest]

Yeah seeing as I'm only 17 and working a part time job + high school, the $400 carbs I've been pricing isn't exactly an option, I probably will wind up going up a few sizes and just saying yay were done, I know I can get a jet set with 85/130 so I'm tempted to try that. This build is my first ever motorcycle and is a budget cafe racer build, in theory, so I'm not looking to drop huge amounts of money.

 

[marcel]

You haven't really posted this in the right subforum, but here's a guide anyway: http://www.dansmc.com/carbs2.htm

 

[coldfuzion76]

I finally got my carbs straightened out(mostly), but only by running genuine K&N filters. You need the 54mm version, I used part number RC-2330. I think I wound up with 125 and 78 jets if I remember right, but I could probably stand to go to an 80, as I have just a hint of off-idle hesitation. I understand the frustration in wanting some firm numbers. There's also this discussion: http://www.hondatwins.net/forum/viewtopic.php?f=59&t=24687 over on honda twins about using a pipe to make a sort of velocity stack to help. Mine's working ok without it, but there's a lot of varied results out there, for sure.